Snail shell cracking?

I bought some "mystery snails" and noticed this little guy's shell is cracked kinda badly. Is there anything I can do to help him heal? I'm no snail expert, but he eats fine and his mobility seems to be better than the two larger ones. I uploaded a few pics for referencs

His mobility probably is better, which is how he ended up crawling out of a tank and falling onto the ground at some point. At least, that's how a couple of my mystery snails got similar looking cracks.

It won't hurt it, it just looks kind of funny. It will grow back in over time (looks like it already has a bit), provided the snail gets enough calcium.

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